#include<iostream>

using namespace std;

int n;

int gcd(int a,int b)
{
    return b?gcd(b,a%b):a;
}

int main()
{
    scanf("%d",&n);
    
    while(n--)
    {
        int a,b;
        scanf("%d%d",&a,&b);
        cout<<gcd(a,b)<<endl;
    }
    return 0;
}